UninitializedPropertyAccessException for getMediaPlayerHandler

[mahibi]

from gplay for 19.0.0

Exception java.lang.RuntimeException:
  at android.app.ActivityThread.performDestroyActivity (ActivityThread.java:6091)
  at android.app.ActivityThread.handleDestroyActivity (ActivityThread.java:6124)
  at android.app.ActivityThread.handleRelaunchActivityInner (ActivityThread.java:6477)
  at android.app.ActivityThread.handleRelaunchActivity (ActivityThread.java:6352)
  at android.app.servertransaction.ActivityRelaunchItem.execute (ActivityRelaunchItem.java:71)
  at android.app.servertransaction.ActivityTransactionItem.execute (ActivityTransactionItem.java:45)
  at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:135)
  at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:95)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:2574)
  at android.os.Handler.dispatchMessage (Handler.java:106)
  at android.os.Looper.loopOnce (Looper.java:226)
  at android.os.Looper.loop (Looper.java:313)
  at android.app.ActivityThread.main (ActivityThread.java:8779)
  at java.lang.reflect.Method.invoke
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:604)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1067)
Caused by kotlin.UninitializedPropertyAccessException:
  at com.nextcloud.talk.chat.ChatActivity.getMediaPlayerHandler (ChatActivity.kt:396)
  at com.nextcloud.talk.chat.ChatActivity.stopMediaPlayer (ChatActivity.kt:2482)
  at com.nextcloud.talk.chat.ChatActivity.onDestroy (ChatActivity.kt:3510)
  at android.app.Activity.performDestroy (Activity.java:8864)
  at android.app.Instrumentation.callActivityOnDestroy (Instrumentation.java:1419)
  at android.app.ActivityThread.performDestroyActivity (ActivityThread.java:6078)